decouple deployment project permissions

At the moment, the deployment project has 2 permissions viz:

1. The view permission which allows users access to view only on the projects and all environments
2. The Edit permissions controls who can change the details of the project, related plan and any of the environment configuration. Users with edit permission can also create releases.

Users with the second permission might not be administrators but giving them the second permission will wield them extra privileges of doing some admin level configurations like dedicating agent to an environment

It will be a good idea to have a third permission called admin for example that decouples the extra privileges on the edit. Users with edit permission should just be able to change the tasks, add task and other non-admin tasks like adding variables.